Why security regime based on multilateralism did not appear in Northeast Asia even in the era of post-cold war? In this essay, two reasons have been concluded: Firstly, the rough peace has been maintained by the security framework composed of balance of power since 1945, and the dynamic for change has been eliminated by that. Secondly, the conflict of core interests and identification between those countries, the differences among the preference to how to cooperate between the great powers and middle power, the doubts about each intention between great powers have been created the complicated security dilemma by the nuclear crisis on Korea peninsula. Those countries have been not only suspicious of others and tended to increase power for the sake of self-protection. Finally, because of the complicated security dilemma and those historical factors, security regime is quiet hard to appear in Northeast Asia, and in the visible future, balance of power may be still the foundation of stability in Northeast Asia.